Bounces from 2-6 targets, on higher lvl you can use it to harass enemy from almost safe place, because it will bounce trough minions/enemies to your target (sometimes it will not jump like you want it to and end not hitting the target you wanted).

Tips & Tricks:

It deals magic damage (not physical like some think).
Try to hit the furthest minion you can afford to hit your target, as it grants you the best chance to actually hit your enemy, as well as almost safe place, from which is easy to avoid enemy attacks.
Every bounce without Killer Instincts results in damage lowered by 10% so try to reduce the count of bounces to get maximum damage output, although sometimes it may be not safe and not recommended.

Activating it before bouncing blades will sustain the damage on each bounce as well as give to enemies debuff which decreases heal effects by 50%. Activation before Shunpo results in lowered damage (15-35%) we receive for 3 seconds.
By: Kusoku

Tips & Tricks:

Activate it as often as possible or use it right before skills for some tactics.
On lvl 2 of this skill duration is almost as long as cool down of this skill, so you can activate it earlier and wait for cool down almost to be up and then use it 2 times almost in the same time.
Use Killer Instincts while the blade is going to the target (but before it hits). Thanks to it your power will not decrease after each bounce and you'll surprise enemy by sudden power up activation and half heal debuff. You may also activate it after it hits but it will sustain the damage that was lowered (not the full damage it had on beginning).
Using it right before Shunpo is probably one good habit, as it will help to lower damage you always receive and sometimes it is this death or alive line.

Shunpo Great way to get to the enemy or escape.

Instant movement to the target, which is putting you before/behind the target (depends on Killer Instincts usage) and gives physical attack attempt right after it (if it's an enemy of course). It can be used offensively as well as defensively. Closing the gap, dealing damage on target or using on nearby minion to dodge skill shot, widen the gap.

Tips & Tricks:

Can be used to move to a nearby Sight Ward or Noxious Trap etc. (it will reveal ward not sure about traps and so on)
You can easily escape ultimates like Bullet Time, Absolute Zero or even Death Lotus etc. (skillful ones may even evade ultimates like Enchanted Crystal Arrow and so on)

Death Lotus Enemies nearby be aware, because death awaits you. Even tough it's simple to break, in my opinion it's still one of the top ultimates in-game.

Deals massive damage up to 3 enemies in range by throwing 10 daggers over 3 seconds each dagger deals 50/65/80 basic damage (+0,25 AP and +0,5 AD). But even tough it's a powerful ultimate DO NOT BE CARELESS every stun/knockback/silence is able to break it and you'll be in a very uncomfortable position, so you need SOME common sense: be patient and watch carefully when enemies are throwing their CC skills, then use it.

Many times I have seen Katarinas go alone into a group of full HP enemies and ultimate, and wind up dying without getting any kills from the situation. Although Katarina is able to pull off some crazy stunts, try not to get too cocky.

Try to keep from using your ultimate unless in team fights, ganks or situations where you can guarantee dealing enough damage to kill your target(s).

Tips & Tricks:

Try to use Killer Instincts+ Shunpo before Death Lotus which will minimize damage you receive and may give you enough health to fully cast Death Lotus, which also enables safer tower dives for your combo.
Remember that most champions with CC will try to save a skill for your Death Lotus like Talon's Cutthroat. Try waiting till everybody gets engaged in fight then use powered Shunpo followed by Death Lotus.
Death Lotus also hits stealthed units, you may also take advantage of it to notice incoming gank (because your ultimate becomes available whenever some champion is in its range).
Be wary when using items like Zhonya's Hourglass or Hextech Gunblade as they break your ultimate on usage.

League of Legends is a team based, real time strategy game set in a mythical world of swords & magic where epic battles decide the fate of mystical nations. Game players take on the role of a Summoner who conjures and controls champions to fight for them at the Institute of War. During game play champions gain experience and items to enhance their skills and abilities. How players develop and play their champions can be the difference between a crushing defeat or a glorious victory!